工作在单光子能级的快速超灵敏静电计
Fast and Ultrasensitive Electrometer Operating at the Single-Photon Level
摘要：
我们展示了快速和超灵敏的电荷检测与腔嵌入式库珀对晶体管（cCPT）通过分散读出其约瑟夫森电感。我们报告的最小电荷灵敏度的$14$ $μe/\sqrt{\mathrm{Hz}}$的$1$ MHz的顺序上使用$16$阿瓦的功率，对应于单光子水平的腔的检测带宽。此外，我们测得的灵敏度在该器件量子极限的$5$的一个因子内。cCPT的单光子级灵敏度与rf-SET相当，rf-SET通常使用对应于其储能电路中数十万光子的皮瓦功率进行操作。我们的研究结果支持使用cCPT介导达到单光子强耦合制度的光机械相互作用的可行性。
英文摘要：
We demonstrate fast and ultrasensitive charge detection with a cavity-embedded Cooper pair transistor (cCPT) via dispersive readout of its Josephson inductance. We report a minimum charge sensitivity of $14$ $μe/\sqrt{\mathrm{Hz}}$ with a detection bandwidth on the order of $1$ MHz using $16$ attowatts of power, corresponding to the single-photon level of the cavity. In addition, our measured sensitivities are within a factor of $5$ of the quantum limit for this device. The single-photon-level sensitivity of the cCPT is comparable to that of the rf-SET, which typically operates using picowatts of power corresponding to hundreds of thousands of photons in its tank circuit. Our results support the feasibility of using the cCPT to mediate an optomechanical interaction that reaches the single-photon strong coupling regime.
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